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This is a list of Prime Ministers of the United Kingdom by age. This table can be sorted to display Prime Ministers of the United Kingdom by name, order of office, date of birth, age at appointment, length of retirement, or lifespan. Age at appointment is determined by the day a prime minister assumed office for the first time. Length of retirement is determined from the day a prime minister leaves office for the final time until their death. Two measures of longevity are given; this is to allow for the differing number of leap days occurring within the life of each Prime Minister. The first figure is the number of days between date of birth and date of death, allowing for leap days; in parentheses the same period given in years and days, with the number of whole years that the Prime Minister had lived, and the days being the remaining number of days from their last birthday. Where the prime minister in question is still living, the longevity is calculated up to . ==Overview== The average age of accession is 53 years and 43 days, which falls between Earl of Derby (23rd) and Margaret Thatcher (24th). The youngest Prime Minister to assume office was William Pitt the Younger (aged 24 years, and 205 days). The youngest Prime Minister to leave office was Duke of Grafton (aged 34 years, and 122 days). The oldest Prime Minister to assume office for the first time was Viscount Palmerston (aged 70 years, and 109 days). The oldest Prime Minister to be appointed overall was William Ewart Gladstone (aged 82 years, and 230 days) when he was appointed for the fourth and final time on August 15, 1892. Gladstone was also the oldest Prime Minister to leave office (aged 84 years and 63 days) at his final retirement on March 2, 1894. The oldest living former Prime Minister is John Major, born March 29, 1943 (aged ). Gordon Brown is the second oldest, 7 years, and 328 days younger than Major. Brown was born on February 20, 1951 (aged ). The youngest living former Prime Minister is Tony Blair, born May 6, 1953 (aged ). The youngest living Prime Minister is the incumbent, David Cameron, born October 9, 1966 (aged ). The longest-lived prime minister was James Callaghan, who died on the eve of his 93rd birthday on March 26, 2005. Harold Macmillan was the second longest-lived, 42 days short of Callaghan. The oldest living prime minister, John Major, will tie Macmillan if he lives to February 15, 2036, and tie Callaghan if he lives to March 28, 2036. The second-oldest living prime minister, Gordon Brown, will tie Macmillan if he lives to January 8, 2044, and tie Callaghan if he lives to February 19, 2044. The shortest-lived prime minister was Duke of Devonshire who was 44 years, and 147 days when he died on October 2, 1764. The prime minister with the longest retirement is Duke of Grafton, at 41 years and 45 days. He achieved this record on January 1, 1799, surpassing Earl of Bute, who died 28 years, and 337 days after leaving office. Bute held the record for 7 years. The closest anyone has been to Grafton's record since was Henry Addington, who left office on May 10, 1804, and died 39 years, and 281 days later on February 15, 1844. Of the three former prime ministers currently alive, John Major has been retired the longest, he left office on May 2, 1997. If he is still alive on June 24, 2038, he will surpass Grafton's record and become the longest lived prime minister after office. The prime minister with the shortest retirement is Henry Campbell-Bannerman, who died only 19 days after leaving office. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Prime Ministers of the United Kingdom by age」の詳細全文を読む スポンサード リンク
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